# The experimental probability of randomly choosing a red ball from a bag filled with red and blue is #75%.# if there are 4 blue balls in the bag, how many red balls are there?

##### 1 Answer

Feb 19, 2018

#### Answer:

Number of Red balls

#### Explanation:

Given -

Probability of taking one red ball is

Number of Blue balls

Number of Red balls

Probability of taking one red ball is

Let Number of Red Balls

#0.75=x/(x+4)#

#x/(x+4)=0.75#

#x=0.75(x+4)=0.75x+3#

#x-0.75x=3#

#0.25x=3#

#x=3/0.25=12#

Number of Red balls#=12#